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首页> 外文期刊>Bulletin of the Chemical Society of Japan >Purified Coating Solution and Growth Scheme of the YBaiCu_3O_7-x Superconductors in Metal Organic Deposition Using Trifluoroacetates
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Purified Coating Solution and Growth Scheme of the YBaiCu_3O_7-x Superconductors in Metal Organic Deposition Using Trifluoroacetates

机译：三氟乙酸盐金属有机沉积中YBAICU_3O_7-X超导体的纯化涂布溶液和生长方案

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Metal organic deposition using trifluoroacetate(TFA-MOD)is one of the most promising approaches to YBa_2Cu_3O_7-x superconductors.In this process,CuO nanocrystallites in calcined film never cause random orientation,which is a major problem in the other solution processes.A "quasi-liquid network" created during the firing process suppresses the influence of the nanocrystallites on the epitaxial structure.Impurities in the coating solution cause Y,Ba,and Cu compounds;a long calcining process leads to CuO grain growth in the YBa_2Cu_3O_7-x film.These compounds deteriorate superconducting properties in two ways.One is a direct physical obstacle and the other is an indirect chemical influence.In the latter mode,non-stoichiometric area,which is induced by the compound,breaks up the quasi-liquid and the quasi-liquid changes into the other phase.Therefore,the actual YBa_2Cu_3O_7-x film is thinner and the superconducting properties degrade.To reduce the influence of CuO nanocrystallites,excess humidity in the firing gas is effective because increased quasi-liquid consumes the nanocrystallites.However,the improvement is imperfect.A combination of highly purified coating solution and optimal calcining process is required to obtain high performance YBa_2Cu_3O_7-x superconductors.With such a combination,YBa_2Cu_3O_7-x films having critical current density of 5-7 MA/cm~2(77 K,0 T)are routinely obtained.
机译：金属有机沉积使用三氟乙酸盐（TFA-MOD）是YBA_2CU_3O_7-X超导体最有希望的方法之一。在该过程中，CuO纳米晶体在煅烧膜中从未引起随机取向，这是其他解决方案过程中的一个主要问题。“在烧制过程中产生的准液体网络抑制了纳米晶体对外延结构的影响。涂料溶液中的Impripuritisigs导致Y，Ba和Cu化合物;长煅烧过程导致YBA_2Cu_3O_7-X膜中的CuO晶粒生长。这些化合物以两种方式劣化超导特性。一个是直接物理障碍物，另一个是间接的化学影响。后一种模式，由化合物诱导的非化学计量区域，分解准液体和准液体变为另一相。因此，实际的YBA_2Cu_3O_7-X膜较薄，超导性能降低。减少CuO纳米晶体，过量的影响烧制气体中的湿度是有效的，因为增加的准液体消耗纳米晶体。然而，随着诸如组合来获得高性能的高度纯净的涂布溶液和最佳煅烧过程的组合是不完美的。常规获得具有5-7mA / cm〜2（77k，0t）的临界电流密度的YBA_2CU_3O_7-X膜。

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